CGP 71683 HCl

CGP71683 hydrochloride is a competitive neuropeptide Y5 receptor antagonist with a Ki of 1.3 nM, and shows no obvious activity at Y1 receptor (Ki, >4000 nM) and Y2 receptor (Ki, 200 nM) in cell membranes.

Signaling Pathways >> GPCR/G Protein >> Neuropeptide Y Receptor

Research Areas >> Neurological Disease

Ki: 1.3 nM (Y5 receptor), 200 nM (Y2 receptor), >4000 nM (Y1 receptor)[1]

CGP71683 hydrochloride is a competitive neuropeptide Y5 receptor antagonist with a Ki of 1.3 nM, and shows no obvious activity at Y1 receptor (Ki, >4000 nM) and Y2 receptor (Ki, 200 nM) in cell membranes[1].

CGP71683 (15 nmol/rat, icv, twice daily) shows anorexigenic effect, reducing food intake and bady weight of fed rats. CGP71683 causes 3-times higher serum total T4 and 37% increase in free T4 in the fasted rats than in the fasted controls rats[2].

Rats[2] CGP71683 is dissolved in 30% DMSO and kept frozen at -20°C until the experiment. Each microinjection consists of 2 μL of either vehicle (30% DMSO) or CGP71683 (7.5 nmol/μL; 15 nmol/rat) injected during 30-60 s through the guide cannula, as the following protocols: I - rats with free access to chow receive 6 microinjections (15 nmol/rat, 10-14 h interval between each one) and are killed 1 h after the last injection, between 9 and 10 a.m. Food intake is estimated by the reduction in chow mass (g), evaluated daily, immediately before each icv injection. II - 72 h-fasted rats receive a single microinjection of vehicle or CGP71683 (15 nmol/rat) and sacrificed 1 h latter. III - during a period of 72 h of fasting, rats are treated with multiple injections of vehicle or CGP71683 with the same protocol used for fed animals, and the fasting period started 10 h before the first microinjection. At the end of experimental protocols, rats are decapitated and serum is obtained from trunk blood for the measurement of the concentrations of hormones[2].

[1]. Lecklin A, et al. Receptor subtypes Y1 and Y5 mediate neuropeptide Y induced feeding in the guinea-pig. Br J Pharmacol. 2002 Apr;135(8):2029-37.

[2]. Costa-e-Sousa RH, et al. Central NPY-Y5 receptors activation plays a major role in fasting-induced pituitary-thyroid axis suppression in adult rat. Regul Pept. 2011 Nov 10;171(1-3):43-7.

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